hinting anomalies

It appears that Wirecast doesn't hint files consistently. In one setup I have, the files output from Wirecast are missing the Audio Hint Track altogether, though the Video Hint track is fine. In another setup, the hinted file streams at quarter size. In both instances, if I bring the files into QTPro, strip the hint tracks, and then re-hint, the files stream properly. I am recording to disk using H.264, and as far as I know I have the hint settings the same on both systems. Are there hinting details that I am inadvertently setting wrong? - Paul